<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        @-webkit-keyframes mask-move {
            0% {
                -webkit-transform: translateX(0);
                transform: translateX(0);
            }
            100% {
                -webkit-transform: translateX(129px);
                transform: translateX(129px);
            }
        }
        @keyframes mask-move {
            0% {
                -webkit-transform: translateX(0);
                transform: translateX(0);
            }
            100% {
                -webkit-transform: translateX(129px);
                transform: translateX(129px);
            }
        }
        @-webkit-keyframes mask-inner-move {
            0% {
                -webkit-transform: translateX(0);
                transform: translateX(0);
            }
            100% {
                -webkit-transform: translateX(-129px);
                transform: translateX(-129px);
            }
        }
        @keyframes mask-inner-move {
            0% {
                -webkit-transform: translateX(0);
                transform: translateX(0);
            }
            100% {
                -webkit-transform: translateX(-129px);
                transform: translateX(-129px);
            }
        }
        *,
        *:before,
        *:after {
            box-sizing: border-box;
        }
        body,
        html {
            height: 100%;
        }
        body {
            padding: 0;
            margin: 0;
            display: -webkit-box;
            display: -webkit-flex;
            display: -ms-flexbox;
            display: flex;
            -webkit-box-pack: center;
            -webkit-justify-content: center;
            -ms-flex-pack: center;
            justify-content: center;
            -webkit-box-align: center;
            -webkit-align-items: center;
            -ms-flex-align: center;
            align-items: center;
            background: #89cb66;
            font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
        }
        .focus {
            font-size: 3rem;
            text-transform: uppercase;
            color: white;
            letter-spacing: 0.2rem;
            line-height: 1;
            position: relative;
            width: 179px;
        }
        .focus:before {
            content: 'Focus';
            -webkit-filter: blur(3px);
            filter: blur(3px);
        }
        .focus:after {
            content: '';
            position: absolute;
            width: 50px;
            height: calc(100% + 8px);
            top: -4px;
            left: 0;
            border-top: 2px solid;
            border-bottom: 2px solid;
            -webkit-animation: mask-move 1s linear infinite alternate;
            animation: mask-move 1s linear infinite alternate;
        }
        .focus--mask {
            overflow: hidden;
            position: absolute;
            width: 50px;
            height: 100%;
            top: 0;
            left: 0;
            background: #89cb66;
            -webkit-animation: mask-move 1s linear infinite alternate;
            animation: mask-move 1s linear infinite alternate;
        }
        .focus--mask-inner {
            -webkit-animation: mask-inner-move 1s linear infinite alternate;
            animation: mask-inner-move 1s linear infinite alternate;
        }
        .credits {
            color: white;
            position: absolute;
            bottom: 0;
            left: 50%;
            -webkit-transform: translateX(-50%);
            -ms-transform: translateX(-50%);
            transform: translateX(-50%);
            font-weight: 200;
            letter-spacing: 0.05rem;
            font-style: italic;
            text-align: center;
        }
        .credits a {
            color: white;
            text-decoration: none;
            font-weight: normal;
        }
        .credits a:hover {
            text-decoration: underline;
        }
    </style>
</head>
<body>
<div class="focus">
    <div class="focus--mask">
        <div class="focus--mask-inner">Focus</div>
    </div>
</div>
</body>
</html>